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Analog Devices Inc. LT3754IUH#PBF
- Part No.:
- LT3754IUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LT3754IUH#PBF.pdf
- Description:
- IC LED DRVR CTRLR PWM 50MA 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:699
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Product details
Overview
LT3754IUH#PBF from Analog Devices (formerly Linear Technology) is a 16-channel, ±2.8% current-matched LED driver with integrated step-up DC/DC controller, delivering up to 45V output and programmable per-string current from 10mA to 50mA. It features True Color PWM™ dimming up to 3000:1, internal soft-start, open-LED fault detection, and thermal derating via TSET pin - deployed in automotive display backlighting requiring high channel count and precise brightness control.
For engineers reviewing the LT3754IUH#PBF datasheet, LT3754IUH#PBF pinout, LT3754IUH#PBF application, or LT3754IUH#PBF equivalent, key selection criteria include 32-pin 5mm × 5mm QFN thermal performance, ISET-resistor-based current programming, VC-loop stability for boost regulation, and fault-flag timing behavior during PWM dimming cycles.
Technical Context
The LT3754IUH#PBF implements a current-mode boost controller with dual transconductance error amplifiers: one regulating VOUT to maintain ≥1.1V at the lowest LED pin (LED amp), the other activating only during full-open-LED fault to clamp VOUT via OVPSET. Its 100kHz–1MHz switching frequency is set by RT or synchronized externally via SYNC, with minimum on/off times of 190ns/170ns ensuring stable operation at high duty cycles.
Each of the 16 LEDx pins functions as an open-collector current sink with ±2.8% matching (typ ±0.7%) across channels at 20mA; current is globally scaled by ISET resistor and individually modulated via CTRL (analog dimming, 25:1 range) or PWM (3000:1). Fault detection latches low on FAULT pin only during PWM high state, enabling robust diagnostics in pulsed-brightness systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 16 independent current sinks, each programmable 10–50mA; parallelable for higher string current |
| Current Matching | ±2.8% max deviation (worst-case), ±0.7% typical at 20mA - ensures uniform luminance across displays |
| PWM Dimming Range | 3000:1 True Color PWM™ - preserves color fidelity without flicker at low duty cycles |
| Switching Frequency | 100kHz–1MHz, resistor-programmable or externally synchronized - enables EMI optimization |
| VOUT Capability | Up to 45V per LED string, with OVP protection programmable via OVPSET pin (e.g., 12.5V–57V) |
| Junction Temp Range | –40°C to +125°C - qualified for automotive cabin and industrial ambient environments |
| Package | 32-pin 5mm × 5mm QFN with exposed thermal pad - θJC = 3°C/W supports >36W backlight power |
Pinout & Package
LT3754IUH#PBF is housed in a thermally enhanced 32-pin plastic QFN (UH package), 5mm × 5mm footprint, with exposed pad (Pin 33) soldered to PCB ground plane for optimal thermal dissipation (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1–LED8, LED17–LED24 (Pins 1–8, 17–24) | 16 LED current sink outputs | Open-collector cathode drivers; each regulates current to ground with ±2.8% matching |
| ISET (Pin 32) | LED current reference input | Resistor-to-ground sets master current (10–50mA); RISET = 5.76kΩ → 50mA |
| VC (Pin 26) | Transconductance error amplifier output | Controls peak inductor current; dual-loop (LED/OVP) feedback node requiring RC compensation |
| FAULT (Pin 14) | Open-LED fault flag | Active-low, latched during PWM low; asserts when any LEDx voltage < 0.5V |
| TSET (Pin 30) | Junction temperature threshold | Resistor divider sets temp breakpoint (e.g., 630mV = ~105°C) for automatic LED current derating |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | 3000:1 ratio with no color shift - achieved via synchronous gate control and fast VC-loop response |
| Adaptive VOUT regulation | VOUT dynamically tracks lowest LED pin voltage (≥1.1V), minimizing power loss and heat in strings with VF variance |
| Programmable thermal derating | TSET and CTRL pins enable custom current-reduction curves vs. ambient or junction temperature |
| Robust fault protection | Dual-level protection: open-LED detection (FAULT), VOUT–LED short detection (6V threshold), and hiccup-mode overcurrent |
| Micropower shutdown | SHDN/UVLO pin draws <10µA in shutdown; 0.7V threshold enables ultra-low-IQ system sleep modes |
Applications
| Automotive Instrument Cluster Backlighting | Notebook Display Edge-Lighting |
|---|---|
Use Scenario: Driving 16-zone RGBW LED arrays behind TFT LCDs in vehicle dashboards with variable ambient light. IC Role / Device Role / Timing Role: Primary LED current controller and boost regulator; synchronizes PWM dimming with display frame rate via SYNC pin. Use Value: ±2.8% current matching eliminates visible banding; 3000:1 dimming enables seamless transition from daylight to night mode. | Use Scenario: Powering thin-profile edge-lit LED strips in 13–15" laptop displays requiring uniform brightness and low EMI. IC Role / Device Role / Timing Role: Single-chip solution integrating boost conversion and multi-string current regulation; RT resistor sets 600kHz switching to avoid audible noise. Use Value: Adaptive VOUT reduces conduction loss by 18% vs. fixed-output drivers; exposed pad enables passive cooling in space-constrained chassis. |
| Industrial HMI Panel Lighting | Medical Imaging Display Backlight |
Use Scenario: Controlling high-reliability LED arrays in factory-floor HMIs exposed to wide temperature swings (–40°C to +85°C). IC Role / Device Role / Timing Role: Temperature-compensated LED driver using TSET/CTRL to derate current above 70°C, preventing thermal runaway. Use Value: Guaranteed –40°C to +125°C operation ensures startup in cold storage; FAULT pin feeds PLC diagnostics bus for predictive maintenance. | Use Scenario: Precision grayscale backlight for diagnostic-grade medical monitors where luminance stability impacts image interpretation. IC Role / Device Role / Timing Role: High-accuracy current source with <±0.7% typical matching and analog dimming for fine-grained brightness calibration. Use Value: 25:1 analog dimming complements PWM for smooth gamma correction; VREF pin provides stable 1.485V reference for external DACs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3755IUH#PBF | Same 16-channel architecture but supports up to 60V VOUT and includes integrated 5V bias supply for external MOSFET gate drive | Better suited for high-VF LED strings (>50V) or designs requiring auxiliary 5V rail; higher BOM cost | Select LT3755IUH#PBF if VOUT > 45V or INTVCC cannot supply gate driver adequately |
| MAX16832ATL+T | 8-channel, 40V max, ±3% matching; uses external oscillator; no TSET thermal derating or True Color PWM™ | Limited to smaller displays; lacks adaptive VOUT and advanced diagnostics; lower integration | Choose MAX16832ATL+T for cost-sensitive 8-string applications where 3000:1 dimming is not required |
Compared with LT3754IUH#PBF, LT3755IUH#PBF extends voltage headroom and adds bias supply capability, while MAX16832ATL+T trades channel count and advanced dimming for lower unit cost and simpler layout - all three require distinct PCB footprints and loop compensation tuning.
Availability
LT3754IUH#PBF is available at Aetrix Electronics and suitable for automotive instrument clusters, notebook display backlighting, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to +125°C operation.
Supply support for LT3754IUH#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its precision analog and power management product lines with full technical documentation and long-term manufacturing commitment.
The LT3754IUH#PBF belongs to Linear's high-performance LED driver family, designed specifically for multi-string, high-efficiency backlighting in automotive, industrial, and professional display applications where accuracy, reliability, and thermal resilience are critical.
FAQ
What is the maximum LED string voltage supported by the LT3754IUH#PBF?
The LT3754IUH#PBF supports up to 45V per LED string at the VOUT pin, with absolute maximum rating of 60V. Operation beyond 45V requires external overvoltage protection or use of the OVPSET pin to clamp VOUT - e.g., setting OVPSET = 1V limits regulated output to 57V, safeguarding LEDs during open-circuit faults.
How does the LT3754IUH#PBF achieve ±2.8% LED current matching across 16 channels?
The LT3754IUH#PBF achieves ±2.8% matching through laser-trimmed internal current references and matched transistor arrays in each LEDx sink. Matching is measured at 20mA with RISET = 14.7kΩ and holds over temperature (–40°C to +125°C); typical matching improves to ±0.7% under controlled lab conditions.
Can the LT3754IUH#PBF drive more than 50mA per channel?
Yes - the LT3754IUH#PBF allows paralleling of LEDx pins (e.g., LED1 + LED2) to double current capacity, supporting up to 100mA per combined string. Thermal design must account for increased power dissipation; the 5mm × 5mm QFN package supports this with proper PCB copper area and airflow.
What is the role of the TSET pin on the LT3754IUH#PBF?
The TSET pin on the LT3754IUH#PBF sets the junction temperature threshold (630mV nominal) at which LED current begins linear derating. When die temperature exceeds this point, the CTRL pin voltage is reduced proportionally, lowering LED current to prevent thermal runaway - critical for sealed automotive enclosures.
Does the LT3754IUH#PBF require external components for basic operation?
Yes - the LT3754IUH#PBF requires external components including: a power inductor (e.g., 10µH), Schottky diode, input/output capacitors (4.7µF ceramic each), ISET resistor (e.g., 5.76kΩ for 50mA), and optional RT resistor for frequency setting. The IC integrates the boost controller, 16 current sinks, reference, and protection logic - eliminating need for discrete op-amps or comparators.
LT3754IUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- 50mA
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LT3754IUH#PBF FAQ
1.How can I place an order for LT3754IUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3754IUH#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT3754IUH#PBF reliable?
The price and inventory of LT3754IUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3754IUH#PBF is usually 5 days.
3.What payment methods are accepted for LT3754IUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3754IUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3754IUH#PBF?
LT3754IUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3754IUH#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT3754IUH#PBF?
For technical support, including LT3754IUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3754IUH#PBF requirements.
6.How does Aetrix verify that LT3754IUH#PBF is sourced from the original manufacturer or authorized distributors?
All LT3754IUH#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT3754IUH#PBF meets industry standards.
7.What is the process for return or replacement of LT3754IUH#PBF?
All LT3754IUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3754IUH#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT3754IUH#PBF part is unused and in its original packaging.
Return procedure for LT3754IUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3754IUH#PBF Tags
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